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Equity (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Equity Offerings          
Aggregate common units sold under ATM (in units)       5,700  
Proceeds from public equity offerings, net       $ 348,352,000 $ 852,873,000
Manager fees       $ 5,200,000  
Distributions of Available Cash          
Distribution per common unit (in dollars per unit) $ 0.84 $ 0.83 $ 0.82    
Declaration Date Jul. 24, 2013 Apr. 25, 2013 Jan. 23, 2013    
Record Date Aug. 06, 2013 May 07, 2013 Feb. 06, 2013    
Payment Date Aug. 14, 2013 May 15, 2013 Feb. 14, 2013    
Minimum
         
Equity          
Common Unit Price (in dollars per share) $ 56.90 $ 51.77 $ 46.03 $ 56.90  
Maximum
         
Equity          
Common Unit Price (in dollars per share) $ 71.20 $ 61.97 $ 55.95 $ 71.20